Installation manual
COOLING
SYSTEM
NOTE:
Periodically check
the
condition
of
the
manifold
pressure
cap.
Ensure
that
the
upper and lower
rubber
seals
are
in good condition and check that
the
vacuum
valve
opens
and closes
tightly.
Carry
a
spare
<:ap.
INSPECT
SEAL
THERMOSTAT
A thermostat, located near the manifold
at
the
front
of
th~
engine, controls the coolant temperature
as
the
coolant
continuously
flows
through
the
closed cooling circuit. When
the engine
is
first
started, the closed thermostat prevents
coolant from
flowing
(some coolant is by-passed through a
hole in the thermostat
to
prevent the exhaust manifold from
overheating).
As
the engine warms
up,
the
thermostat
gradually opens. The thermostat
is
accessible
and
can be
checked, cleaned, or replaced
easily.
Carry a
spare
thermostat
and gasket.
Replacing
the
Thermostat
Remove the cap screws and disassemble the thermostat
housing
as
shown. When installing the
new
thermostat
and
gasket, apply a thin coat of sealant
on
both
sides
of the
gasket before pressing it into place. Do not over-tighten the
cap screws.
Run the engine and check for normal temperatures and that
there
are
no
leaks at the thermostat housing.
HIGH
WATER
TEMPERATURE
.>-------lS~::.;:..~
SWITCH
!
THERMOSTAT
ASSEMBLY
COOLANT
TEMPERATURE
SWITCH
The
coolant
temperature
switch
is
located
near
the
thermostat
housing
(see
illustration).
If
the
coolant's
operating
temperature
reaches
approximately
210
0
F
(99
0
C)
this
switch
will
light
up
the
red
(LED)
engine
overheat
indicator
on
the
control
panel
and
shut
down
the
generator.
AIR
COOLING
Cooling
air
is
continuously
circulated
(by
air
hose)
thru
the
con-
trol
panel
and
around
to
the
engine
air
intake
where
it
passes
thru
a
filter
into
the
engine.
INCOMING
•
COOLING
AIR
RAW
WATER
COOLING
CIRCUIT~
."
.
.
V·::
~FROM
RAW
}·TrVATER
PUMP.
The
raw
water
flow
is created by a positive displacement
impeller pump. This pump draws water directly from the
raw
water source (ocean, lake, or river) through a hose
to
the water strainer. The raw water passes from the strainer
through the raw water pump
to
the water cooled generator
and then to the heat exchanger. The raw water passes thru
the heat exchanger tubes where it cools the circulating fresh
water (coolant). The raw water
is
then discharged into the
water-injected exhaust elbow, mixing with and cooling the
exhaust gasses. This mixture
of
exhaust
gas
and raw water
is discharged overboard by the engine's exhaust gas
discharge pressure.
Engines
~
Generators
19